Prune shasta daisies after the first killing frost hits, according to the Farmer's Almanac. Shasta daisy stems can then be pruned to 1 to 2 inches above the soil line. Shasta daisies are also known as Leucanthemum x superbum.
Shasta daisy maintenance also includes mulching and composting the planting area every spring, and dividing the plant every three or four years. Plant division should occur in the early spring or the late summer. Shasta daisies prefer well-drained fertile soil and full sun conditions. They'll need an inch of water a week, from rain or supplemental watering. Shasta daisies are a butterfly attractor. Stand up tall shasta daisies with a stake. Shasta daisies make a great cut flower choice and are not invasive when grown.